Question: When did Albert Bierstadt graduate from the Dusseldorf School of Painting?
Paraphrase: Mention the year in which Bierstadt graduated from Dusseldorf school of painting?
SPARQL (Wikidata): SELECT ?value WHERE { wd:Q77132 p:P69 ?s . ?s ps:P69 wd:Q680559 . ?s pq:P582 ?value}